Truck box with folded walls

ABSTRACT

A cross-over truck box is provided having folded end walls and folded tub ends that permit the box to be fabricated efficiently, at reduced cost and with improved strength.

FIELD OF THE INVENTION

This invention relates to storage boxes for use with vehicles, and, moreparticularly, to a crossover truck box having a folded wall constructionthat reduces cost, simplifies fabrication and adds strength.

BACKGROUND OF THE INVENTION

One of the most popular accessories for trucks and recreational vehiclesis a truck box used to store and secure a variety of tools and otheritems. One type of truck box is a cross-over box which comprises a frontwall, a back wall, a bottom wall and opposed end walls which areinterconnected to form a hollow interior. The truck box interior isclosed by a top wall or lid pivotal between open and closed positions ona hinge mounted to the back wall, usually with the assistance of gassprings. Each of the end walls of a cross-over box is formed with a wingextension which rests atop the side walls of a pickup truck, forexample, where it may be connected by clamps or other fastening devicesto secure the box in place within the truck bed.

Cross-over boxes are typically made of aluminum tread plate or a similarmaterial which can undergo bending and welding operations in thefabrication process.

With reference to FIGS. 1-5 of the drawings, labeled “Prior Art,”several views are provided depicting a cross-over truck box 10constructed using conventional prior art fabrication techniques.Initially, a sheet 12 of tread plate undergoes a bending operation inwhich it is formed into a tub 14 having a bottom wall 16 joined toupright side walls 18, 20 collectively defining an interior 22 open atthe top and opposite ends. The end walls 24, 26 of the box 10 are eachformed in a bending operation from a sheet 28 of tread plate and have awing extension 30. In order to close the ends of the tub 14, each endwall 24, 26 is positioned at one end and welded in place, e.g. a weld isrequired along the length of the side edges of each end wall 24, 26 andthe end edges of the tub side walls 18, 20, and, along the bottom edgeof each end wall 24, 26 and opposed end edges of the bottom wall 16 oftub 14. Further, to provide a secure connection between the side walls18, 20 of the tub 14 and the wing extension 30 of each end wall 24, 26,each side wall 18, 20 is preferably formed with an outwardly extendingarm 32 at opposite ends. These arms 32 extend along one side of eachwing extension 30 where they are welded in place.

The method of fabrication used to manufacture cross-over truck boxesdescribed above is labor-intensive and relatively expensive consideringall of the welds required to connect the end walls 24, 26 to the tub 14.Further, as best seen in FIG. 1, a section 34 of material at both endsof the sheet 12 forming tub 14 must be removed prior to the bendingoperation in order to form the arms 32 which connect to the end wallwing extensions 30. This drop loss is significant and represents anappreciable amount of lost revenue for manufacturers of truck boxesusing such prior art fabrication method, given the high cost of aluminumtread plate.

SUMMARY OF THE INVENTION

This invention is directed to a cross-over truck box having folded endwalls and folded tub ends that permit the box to be fabricatedefficiently, at reduced cost and with improved strength compared totypical prior art cross-over boxes.

In the presently preferred embodiment, a cross-over truck box isprovided comprising a tub formed in a bending operation with a bottomwall joined to opposed upright side walls collectively defining aninterior open at the ends and at the top. Opposite end edges of eachside wall of the tub are folded over to form side mounting channels, andopposite end edges of the bottom wall of the tub are folded over to formbottom mounting channels. Each channel has an opening which faces theinterior of the tub. Additionally, opposite ends of each side wall areformed with a guide at an upper end thereof The cross-over box furthercomprises opposed end walls each formed in a bending operation with awing extension along a top portion thereof, a side flange along oppositeside edges and a bottom flange along a bottom edge.

The cross-over box is assembled by inserting the wing extension of oneend wall at least partially into the guides of the two side walls at oneend of the tub such that the majority of the end wall is located at anangle within the interior of the tub. The bottom portion of the end wallis then moved toward such end of the tub so that the side flanges of theend wall enter the side mounting channels of the side walls of the tuband the bottom flange of the end wall enters the bottom mounting flangeof the bottom wall of the tub. The same procedure is repeated for theother end wall at the opposite end of the tub. The flanges of the endwalls may be secured within the channels of the tub by any suitablemeans, such as tack welding, crimping, bonding and the like.

The cross-over box of this invention, and its method of fabrication, isless expensive and more efficient than the prior art noted above. Theextent of drop loss of material is substantially reduced, and thetime-consuming and expensive welding operations required to assembleprior art boxes may be eliminated or at least substantially reduced.

DESCRIPTION OF THE DRAWINGS

The structure, operation and advantages of the presently preferredembodiment of this invention will become further apparent uponconsideration of the following description, taken in conjunction withthe accompanying drawings, wherein:

FIG. 1 is a plan view of a sheet employed to fabricate the tub of aprior art cross-over truck box;

FIG. 2 is a perspective view of the tub formed in a bending operationfrom the sheet depicted in FIG. 1;

FIG. 3 is a plan view of sheet of a sheet used in the fabrication of anend wall for connection to the tub shown in FIG. 2;

FIG. 4 is a perspective view of an end wall formed in a bendingoperation from the sheet illustrated in FIG. 3;

FIG. 5 is a perspective view of a partially assembled cross-over truckbox from the tub and end walls shown in FIGS. 1-4;

FIG. 6 is a plan view of a sheet employed to fabricate the tub of thecross-over truck box of this invention;

FIG. 7 is an end view of a tub formed in a bending operation from thesheet shown in FIG. 6;

FIG. 8 is a perspective view of the tub depicted in FIG. 7;

FIG. 9 is a plan view of a sheet employed to form an end wall for thecross-over box herein;

FIG. 10 is a perspective view of an end wall formed in a bendingoperation from the sheet illustrated in FIG. 9;

FIG. 11 is a perspective view of a portion of the tub and one end walldepicting an initial stage of assembling the cross-over box of thisinvention;

FIG. 12 is a perspective view similar to FIG. 11 but depicting the endwall connected to the tub;

FIG. 13 is a perspective view similar to FIG. 8 illustrating analternative embodiment of the tub herein; and

FIG. 14 is an end view of a cross-over box shown in FIG. 13 with an endwall connected to the tub.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to FIGS. 6-12, one embodiment of a cross-over truck box 40in accordance with this invention is illustrated. One part of thefabrication process is the formation of a tub 42 best seen in FIGS. 6-8.For purposes of the present discussion, the terms “vertical,”“horizontal,” “upwardly,” “upper,” “upright” and “lower” refer to theorientation of the box 40 and tub 42 as shown in FIGS. 6-12.

Initially, a blank or sheet 44 of aluminum tread plate or similarmaterial undergoes a bending operation to form the tub 42. In thepresently preferred embodiment, the tub 42 comprises a bottom wall 46joined to two upright side walls 48 and 50 defining an interior 51 whichis open at the ends and at the top. A fold line 52 is shown in FIG. 6 todepict where sheet 44 is folded to form the juncture of bottom wall 46and side wall 48, and sheet 44 is bent at fold line 54 to form side wall50. The side wall 48 includes a lower section 56 between fold line 52and a fold line 58 shown in FIG. 6, a seat 60 between fold line 58 and afold line 62, and, an upper section 64 joined to seat 60 at fold line62. The upper and lower sections 64, 56 of side wall 48 are generallyvertically oriented, and the seat 60 extends generally horizontallybetween them. As seen in FIG. 6, an inverted, U-shaped guide 66 isformed in a bending operation of sheet 44 along fold lines 65 and 67,and it extends vertically upwardly from the upper section 64 of sidewall 48. Similarly, the side wall 50 has a vertical lower section 68formed by bending along fold lines 54 and 70, a horizontally extendingseat 72 between fold lines 70 and 74, and, a vertical upper section 76joined to seat 72 at fold line 74 which extends upwardly to a generallyinverted, U-shaped guide 78 formed in a bending operation of sheet 44 atfold lines 80 and 82.

Each of the bottom wall 46, side wall 48 and side wall 50 undergofurther bending operations in the fabrication of tub 42 to form channelsalong their end edges. Specifically, opposed end edges 84 and 86 of thebottom wall 46 are folded along fold lines 88 and 90, respectively, inan inward direction toward the interior 51 of tub 42, forming a bottommounting channel 92 at each end edge 84, 86, one of which is shown inthe Figs. As such, an opening 94 in bottom mounting channel 92 faces theinterior 51 of the tub 42. Similarly, opposed end edges 96 and 98 ofside wall 48, and opposed end edges 100 and 102 of side wall 50, undergobending operations along fold lines 88 and 90, respectively. The resultis the formation of a side mounting channel 104 along the lower section56 of side wall 48 and a side mounting channel 108 along the uppersection 64 of side wall 48. Each of these side mounting channels 104 and108 has an opening 110 and 114, respectively, which face the interior 51of the tub 42. The bending operation noted above creates the sameconfiguration in the opposite side wall 50. A side mounting channel 116is formed along the vertical lower section 68 of side wall 50 and a sidemounting channel 120 is formed along vertical upper section 76. Each ofsuch side mounting channels 116 and 120 has an opening 122 and 126,respectively, which face the interior 51 of the tub 42.

It should be noted that unlike the prior art construction andfabrication method described above in connection with a discussion ofFIGS. 1-5, there is no drop loss of material along the bottom wall 46 orside walls 48 and 50 of tub 42. The tub 42 is fabricated withoutremoving the section 34 of material, depicted in FIG. 1, which saves asubstantial amount of money in material cost.

Referring now to FIGS. 9 and 10, the fabrication of an end wall 127according to this invention is illustrated. The opposite end wall (notshown) of cross-over box 40 is fabricated in the same manner and thediscussion below applies equally to same. The end wall 127 is made froma blank or sheet 128 of aluminum tread plate or similar material. Itcomprises a bottom edge 130, opposed side edges 132, 134 and an upperportion that undergoes bending operations to form a wing extension 136,described in more detail below. The bottom edge 130 is folded along foldline 138 to form a bottom flange 140. A lower section 142 of side edge132 is folded along fold line 144 to form a lower side flange 146, andan upper section 148 of side edge 132 is bent along fold line 150 toform an upper side flange 152. The lateral or side-to-side dimension ofthe end wall 127 is greater at the upper portion thereof, beginning atthe upper section 148 of the side edge 132 to and including the wingextension 136. The opposite side edge 134 of end wall 127 has a similarconstruction. It includes a lower side flange 154 formed by bending alower section 156 of side edge 134 along fold line 158, and an upperside flange 160 formed by bending an upper section 162 of side edge 134along fold line 164.

The wing extension 136 of end wall 127 comprises a front panel 166, aback panel 168 an inner panel 170 and an outer panel 172 collectivelyforming an open cavity or tray 174 within which tools or other items(not shown) may be stored. The front panel 166 is formed by a bendingoperation along fold lines 176, 178 and 180. The back panel 168 isformed in the same manner along fold lines 182, 184 and 186. The outerpanel 172 undergoes a bending operation along fold lines 188, 190 and192. The inner panel 170 is formed by that portion of the end wall 127which extends vertically upwardly from the upper side flanges 152, 160of respective side edges 132, 134, and it undergoes a bending operationalong fold lines 194 and 196. Further, reinforcing tabs 198 and 200extend outwardly from respective side edges 132, 134 of end wall 127.The tab 198 is folded along fold line 202 to overlap and reinforce aportion of the front panel 166, and tab 200 is folded along fold line204 to overlap and reinforce a portion of the back panel 168. See FIG.10.

With the tub 42 and end walls 127 fabricated as described above inconnection with a discussion of FIGS. 6-10, assembly of the cross-overtruck box 40 proceeds as shown in FIGS. 11 and 12. For ease ofillustration, only one end of the tub 42 and end wall 127 are shown inthe drawings, it being understood that the assembly process is identicalat the opposite end of tub 42.

Initially, the end wall 127 is placed at an angle relative to the tub 42such that its lower end is located within the tub interior 51. In thistitled position, the inner panel 170 of wing extension 136 may beinserted into the guides 66 and 78 of respective side walls 48, 50 oftub 42, a portion of front panel 166 may be inserted into guide 66 ofside wall 48 and a portion of back panel 168 may be inserted into guide78 of side wall 50. As noted above, the side mounting channels 104 and108 of the side wall 48 of tub 42, and the side mounting channels 116and 120 of the tub side wall 50, are open to the interior 51 of the tub42, i.e. the openings 110 and 114 of side mounting channels 104 and 108,as well as the openings 122 and 126 of side mounting channels 116 and120, all face the tub interior 51. Since the end wall 127 is placedwithin the interior 51 of the tub 42, its side flanges 146, 152, 154 and160 face outwardly from the tub interior 51. With the wing extension 136aligned by guides 66, 78 as described above, the end wall 127 may bemoved in an outward direction toward the end of tub 42. That is, withits upper portion at least partially extended into guides 66, 78, thelower portion of end wall 127 essentially swings in an outward directiontoward the end of tub 42. In the course of such movement, the lower sideflange 146 and upper side flange 152 of end wall 127 enter the sidemounting channel 116 and side mounting channel 120, respectively, of theside wall 50 of tub 42; the lower side flange 154 and upper side flange160 of end wall 127 enter respective side mounting channels 104 and 108of tub side wall 48; and, the bottom flange 140 of end wall 127 entersthe bottom mounting channel 92 of the bottom wall 46 of tub 42.

With the flanges 140, 146, 152, 154 and 160 of end wall 127 fully seatedwithin the channels 92, 104, 108, 116 and 120 of tub 42, the end wall127 may be secured to the tub 42 by any suitable means. In particular,the end wall 127 and tub 42 may be connected by tack welding the flangesand channels together, by crimping the channels against the flanges, or,by pouring, injecting or otherwise introducing an adhesive, urethane orother bonding material into the channels and along the flanges. Thissame process is repeated at the opposite end of the box 40 to connectthe end wall 127 and tub 42 together.

Referring now to FIGS. 13 and 14, an alternative embodiment of a truckbox 210 is illustrated having the same end walls 127 as box 40 butincluding a tub 212 with a different end edge configuration. Inparticular, opposite end edges of tub 212 are formed with outwardlyprojecting flanges, e.g. an upper tub side flange 214 and a lower tubside flange 216 extend from respective upper and lower sections 76, 68of the tub side wall 50; an upper tub side flange 218 and a lower tubside flange 220 extend from respective upper and lower sections 64, 56of the tub side wall 48; and, a bottom tub flange 222 extends from thebottom wall 46 of tub 212. In order to connect each end wall 127 of thebox 212 to the tub 212, the side flanges 160 and 154 of end wall 127 areplaced alongside the upper and lower tub side flanges 214, 216,respectively, of tub side wall 50; the side flanges 152 and 146 of endwall 127 are placed alongside respective upper and lower tub sideflanges 218, 220 of the tub side wall 48; and, the bottom flange 140 ofend wall 127 is placed alongside the bottom tub flange 222. A crimpingoperation is then performed on the adjacent flanges noted above toconnect the end walls 127 to tub 212.

The construction and method of fabrication of the cross-over truck boxes40 and 210 of this invention reduces waste of material, simplifies themanufacturing process by reducing or eliminating welding operations anddecreases costs. Further, the strength of the boxes 40 and 210 isimproved compared to truck boxes made according to prior art methods offabrication in the area where the reinforcing tabs 198 and 200 areprovided in the wing extension 136 of end walls 127.

While the invention has been described with reference to a preferredembodiment, it should be understood by those skilled in the art thatvarious changes may be made and equivalents substituted for elementsthereof without departing from the scope of the invention. In addition,many modifications may be made to adapt a particular situation ormaterial to the teachings of the invention without departing from theessential scope thereof. For example, the tub 42 is described above asbeing made from a blank or sheet 44 of aluminum tread plate or a similarmaterial having bottom mounting channels 92 and side mounting channels104, 108 each formed in a bending operation. It is contemplated that thetub 42 may be fabricated from plastic or other material capable of beingmolded such that the channels 92, 104 and 108 are integrally formedduring the molding operation.

Therefore, it is intended that the invention not be limited to theparticular embodiment disclosed as the best mode contemplated forcarrying out this invention, but that the invention will include allembodiments falling within the scope of the appended claims.

What is claimed is:
 1. An enclosure, comprising: a tub including abottom wall, a first side wall and a second side wall collectivelyforming a tub interior; each of said bottom wall and said first andsecond side walls having opposed end edges, a bottom mounting channelbeing formed at each of said opposed end edges of said bottom wall and aside mounting channel being formed at each of said opposed end edges ofsaid first and second side walls, each of said bottom mounting channelsand said side mounting channels having an opening facing said tubinterior; a first end wall and a second end wall each having a bottomedge and opposed side edges, each of said first and second end wallsbeing formed with a side flange at each of said opposed side edges and abottom flange at said bottom edge, said first end wall being at leastpartially positioned within said tub interior and then moved toward oneend of said tub so that said side flange at each side edge of said firstend wall is received within one of said side mounting channels of saidfirst and second side walls of said tub and so that said bottom flangeon the bottom edge of said first end wall is received within one of saidbottom mounting channels of said bottom wall of said tub at said one endof said tub, said second end wall being at least partially positionedwithin said tub interior and then moved toward the other end of said tubso that said side flange at each side edge of said second end wall isreceived within one of said side mounting channels of said first andsecond side walls of said tub and so that said bottom flange on thebottom edge of said second end wall is received within the other of saidbottom mounting channels of said bottom wall of said tub at said otherend of said tub, said side flanges and bottom flange of said first andsecond end walls being secured within respective side mounting channelsand bottom mounting channels of said tub.
 2. The enclosure of claim 1 inwhich each of said side mounting channels and said bottom mountingchannels is formed by a bending operation.
 3. The enclosure of claim 1in which each of said side mounting channels and said bottom mountingchannels is formed by a molding operation.
 4. The enclosure of claim 1in which each of said side flanges and said bottom flanges of said firstand second end walls is formed by a bending operation.
 5. The enclosureof claim 1 in which each of said first and second end walls is connectedto said tub by welding said side flanges and said bottom flanges of saidfirst and second end walls within respective side mounting channels andbottom mounting channels of said tub.
 6. The enclosure of claim 1 inwhich each of said first and second end walls is connected to said tubby crimping together said side flanges and said bottom flanges of saidfirst and second end walls against respective side mounting channels andbottom mounting channels of said tub.
 7. The enclosure of claim 1 inwhich each of said first and second end walls is connected to said tubby adhering said side flanges and said bottom flanges of said first andsecond end walls within respective side mounting channels and bottommounting channels of said tub.
 8. The enclosure of claim 1 in which eachof said first and second end walls is formed with a wing extension, eachof said first and second side walls of said tub being formed with aguide at opposite ends, said wing extension of said first end wall beingat least partially inserted into respective guides on one end of each ofsaid first and second side walls of said tub prior to movement of saidside flanges of said first end wall into respective side mountingchannels of said first and second side walls of said tub and prior tomovement of said bottom flange of said first end wall into said bottommounting channel at one end of said bottom wall of said tub, said wingextension of said second end wall being at least partially inserted intorespective guides on the other end of each of said first and second sidewalls of said tub prior to movement of said side flanges of said secondend wall into respective side mounting channels of said first and secondside walls of said tub and prior to movement of said bottom flange ofsaid second end wall into said bottom mounting channel at the other endof said bottom wall of said tub.
 9. The enclosure of claim 8 in whicheach of said wing extensions comprises a front panel, a back panel, aninner panel and an outer panel interconnected to form a tray at oppositeends of said tub, each of said front and back panels being supported bya reinforcing tab.
 10. The enclosure of claim 1 in which each of saidside mounting channels comprises a first side mounting channel along afirst section of each of said first and second side walls and a secondside mounting channel along a second section of each of said first andsecond side walls.
 11. The method of fabricating an enclosure,comprising: (a) bending a sheet to form a bottom wall, a first side wallat one side edge of the bottom wall and a second side wall of a tubhaving an interior; (b) bending opposite ends of the first side wall toform a side mounting channel at each end having an opening which facesthe tub interior; (c) bending opposite ends of the second side wall toform a side mounting channel at each end having an opening which facesthe tub interior; (d) bending opposite ends of the bottom wall to form abottom mounting channel at each end having an opening which faces thetub interior; (e) bending a sheet having opposed sides and opposed endsto form a first end wall having a side flange along each side and abottom flange along each end; (f) bending a plate having opposed sidesand opposed ends to form a second end wall having a side flange alongeach side and a bottom flange along each end; (g) positioning the firstend wall at least partially within the tub interior and moving it towardone end of the tub so that its side flanges enter respective sidemounting channels of the first and second side walls and so that itsbottom flange enters the bottom mounting channel of the bottom wall atsaid one end of the tub; (h) positioning the second end wall at leastpartially within the tub interior and moving it toward the other end ofthe tub so that its side flanges enter respective side mounting channelsof the first and second side walls and so that its bottom flange entersthe bottom mounting channel of the bottom wall at said other end of thetub; (i) connecting the first and second end walls to the first andsecond side walls and to the bottom wall of the tub.
 12. The method ofclaim 11 in which step (i) comprises welding the side flanges of thefirst and second end walls within the side mounting channels atrespective ends of the first and second side walls of the tub, andwelding the bottom flange of the first and second end walls within thebottom mounting channel at respective ends of the bottom wall of thetub.
 13. The method of claim 11 in which step (i) comprises crimping theside flanges of the first and second end walls within the side mountingchannels at respective ends of the first and second side walls of thetub, and crimping the bottom flange of the first and second end wallswithin the bottom mounting channel at respective ends of the bottom wallof the tub.
 14. The method of claim 11 in which step (i) comprisesbonding the side flanges of the first and second end walls within theside mounting channels at respective ends of the first and second sidewalls of the tub, and bonding the bottom flange of the first and secondend walls within the bottom mounting channel at respective ends of thebottom wall of the tub.
 15. The method of claim 11 further including thestep of bending each of the first and second side walls to form a guideat opposite ends thereof.
 16. The method of claim 15 further includingthe step of bending each of the first and second end walls to form awing extension.
 17. The method of claim 16 in which step (g) comprisesinserting at least a portion of the wing extension of the first end wallinto the guides at one end of each of the first and second side walls ofthe tub and then moving the first end wall within the tub interiortoward said one end of the tub.
 18. The method of claim 17 in which step(h) comprises inserting at least a portion of the wing extension of thesecond end wall into the guides at the other end of each of the firstand second side walls of the tub and then moving the second end wallwithin the tub interior toward the other end of the tub.
 19. Anenclosure, comprising: a tub including a bottom wall, a first side walland a second side wall collectively forming a tub interior, each of saidbottom wall and said first and second side walls having opposed endedges; a first end wall and a second end wall each having a bottom edgeand opposed side edges, each of said first and second end walls beingformed with a side flange at each of said opposed side edges and abottom flange at said bottom edge, said first end wall being at leastpartially located within said tub interior so that said side flange ateach side edge of said first end wall is positioned adjacent to one ofsaid end edges of said first and second side walls of said tub and sothat said bottom flange on the bottom edge of said first end wall ispositioned adjacent to one of said end edges of said bottom wall of saidtub at said one end of said tub, said second end wall being at leastpartially located within said tub interior so that said side flange ateach side edge of said second end wall is positioned adjacent to theother of said end edges of said first and second side walls of said tuband so that said bottom flange on the bottom edge of said second endwall is positioned adjacent to the other of said bottom mountingchannels of said bottom wall of said tub at said other end of said tub,said side flanges and bottom flange of said first and second end wallsand said end edges of said tub being crimped together to secure saidfirst and second end walls to said tub.
 20. The enclosure of claim 19 inwhich each of said first and second end walls is further connected tosaid tub by at least one weld where said side flanges and said bottomflanges of said first and second end walls and said end edges of saidtub are crimped together.
 21. An enclosure, comprising: a tub includinga bottom wall, a first side wall and a second side wall collectivelyforming a tub interior, each of said bottom wall and said first andsecond side walls having opposed end edges; a first end wall and asecond end wall each having a bottom edge and opposed side edges, eachof said first and second end walls being formed with a side flange ateach of said opposed side edges and a bottom flange at said bottom edge,said first end wall being at least partially located within said tubinterior so that said side flange at each side edge of said first endwall is positioned adjacent to one of said end edges of said first andsecond side walls of said tub and so that said bottom flange on thebottom edge of said first end wall is positioned adjacent to one of saidend edges of said bottom wall of said tub at said one end of said tub,said second end wall being at least partially located within said tubinterior so that said side flange at each side edge of said second endwall is positioned adjacent to the other of said end edges of said firstand second side walls of said tub and so that said bottom flange on thebottom edge of said second end wall is positioned adjacent to the otherof said bottom mounting channels of said bottom wall of said tub at saidother end of said tub, said side flanges and bottom flange of said firstand second end walls and said end edges of said tub being crimpedtogether to secure said first and second end walls to said tub; saidfirst end wall and said second end wall each being formed with a wingextension comprising a front panel, a back panel, an inner panel and anouter panel interconnected to form a tray at opposite ends of said tub,each of said front and back panels being supported by a reinforcing tab.